Holotype:
Locality: Rio Negro Province, Argentina.
Horizon: Rio Colorado Formation.
Biostratigraphy:
Age: Coloradoan Tetrapoda Assemblage, Age: Santonian-Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.
Material: Fragmentary skeleton.
SALGADO, CORIA & HEREDIA, 1996
11 individuals, juveniles and sub adults.